Improvement in watches



K. BIGE'LoW.

WATCH.

Patented Nov. 2, 1875.

faz/671507 t 4^ @b/25m @@MM' N. PETERS, PMDTO-LITHOGRAPHER, WASHINGTON, D C.

UNITED ASTATES.

PATENT OFFICE.

JOHN K. BIGELOW, OF SPRINGFIELD, ILLINOIS.

IMPROVEMENT IN-WATCHES.

Specification forming part of Letters Patent No. l169.512, dated November 2, 1875; application led April 2, 1874.

To all whom it may concern:

Be it known that I, JOHN K. BIGELOW, of Springfield, in the county of Sangamon and State ot' Illinois, have invented certain new and useful Improvements in Watches, of which the following is a speciication:

My invention consists of a new construction oi' barrel-bridge, dust-band, and Afastening for the latter, which will be hereafter more fully explained.

One object ot' my invention is to cheapen the manufacture ot' watches by the use ot' more lathe-work, and by diminishing the number of operations in Viinishing the barrel-bridge and dust-band.

In the accompanying drawings, Figure l is a plan view of the top plate and barrel-bridgev of my watch. Fig. 2 is a vertical section ofthe top plate, pillar-plate, and dust-band. Fig. 3 is a detached view ot' the barrel-bridge. Fig. 4 is bottom view of the top plate, showing the barrel-bridge in place. Fig. 5 is a detached view of aportion of' the dust-ring, showing the recess in the ring. Fig. 6 is a side or edge view of the barrel-bridge, showing the lip thereon, but in an inverted position. Fig. 7 shows the pillar-plate and top plate, with the dust-ring removed. Fig. 8 is a detached and enlarged section, showing the recess and screw for locking the dust-ring.

My improved barrel-bridge a is made from a thick piece ot' plate metal. The inner border of this bridge is made with a neat curve to improve its appearance, and the outer border is turned with a bevel to correspond with A a bevel upon the top-plate, thus forming a complete' circular bevel to receive the dustring, as will hereafter be described. After the ends of the barrel-bridge are fitted to the top plate, as shown in Fig. 6, and the under side of the bridge has been milled out for the barrel, the bridge yet has substance enough to make it firm, and when put in place the under side ot' the barrel-bridge comes down flush with the under side of the top plate b, as shown in Fig. 7.

My dust-ring c is made without any irregular projections on the outside, in order to facilitate turning the saine upon a lathe. Both the inside and the outside ot' this dust-ring are slightly beveled to correspond with the bevel of the top plate andthe outer border of the barrel-bridge, already described, and also to correspond with the bevel-shoulder d upon the pillar-plate, Fig. 7 or, in other words, the upperedge of the dust-ring has a smaller Vdiameter than the lower edge of the same.

In putting the dust-ring in place the inner diameter does not come in contact with the top plate and barrel-bridge until the last moment, when the ring is brought home, and this prevents rubbing ott' the gilding, and in removing the ring it is, from the tirst, instantly freed from contact with the top plate on account ot' the bevel-joint. screws, e, Fig. 8, or other equivalent devices, are inserted into the pillar-plate, and then a small recess, c', Fig. 5, is made on the inner diameter ofthe lower edge of the dust-ring. By these devices the ring is fastened in place, one edge ofthe ring being first slipped over the head of one screw, and then the other slipped on and caught in like manner. By this arrangement the lower edge of the dustring isl brought down and held in place to form a close joint upon the horizontal surface of the pillar-plate outside of the shoulder d, which closes the small recesses in the edge of the ring. Said recesses are made for inserting the tool in removing the ring in the usual way.

The screws above'described are adjustable, and therefore the joint itself may always be made tight by giving a turn to the screws after long wear, which is not the case with the common snap-joint.

By this manner of making a dust-ring it can be left much heavier-consequently much firmer-and not liable to get out of shape. No openings are left in the dust-ring for the barrel or main wheel, as in the usual manner, but all openings are closed.

I claiml. The abovefdescribed barrel-bridge a, with its lower edge coming down flush with the under side of the top plate, and having a beveled outer edge corresponding with the beveled outer edge of said top plate, thus forming a complete annular and bevel bearing` for the inside bevel of the dust-ring c, substantially as set forth.

2. The combination ot' a dust-ring, having l Two or more @bevel inside' surface extending from top to 4. The'sorews oreatehes e in combination bottom', its above described, with Itc'orrespondwith the milled recesses on the inside of the ing shoulder ou the piller-plate, substantially dust-ring, for holdin g said ring` in place, subas set forth. stantially as set forth.

3. rlhe dust-ring c, provided with an inside J OHN K. BIGELOW. bevel for the purpose of forming a close joint Witnesses: A or joints, and for easy rem-oval of said ring, W. B. MILLER,

substantially as set forth. A. L. HoWEs. 

